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8.3 Enable a Warning Banner for the SSH Service

Information

The contents of the Banner string in the /etc/ssh/sshd_config file are sent to the remote user before authentication is allowed, requiring that the user read the legal caution.

Performing these steps will ensure the appropriate legal caution is displayed to any user accessing the system via SSH.

Solution

Perform the following to implement the recommended state:

# awk '/^#Banner/ { $1 = "Banner" } { print }' /etc/ssh/sshd_config > /etc/ssh/sshd_config.CIS

# mv /etc/ssh/sshd_config.CIS /etc/ssh/sshd_config

# svcadm restart svc:/network/ssh

See Also

https://workbench.cisecurity.org/benchmarks/4777

Item Details

Category: CONFIGURATION MANAGEMENT, SYSTEM AND SERVICES ACQUISITION

References: 800-53|CM-2, 800-53|CM-6, 800-53|CM-7, 800-53|CM-7(1), 800-53|CM-9, 800-53|SA-3, 800-53|SA-8, 800-53|SA-10, CSCv7|5.1

Plugin: Unix

Control ID: 1864cf0574786a110459bae08802b798fa2ff2eab32c43c585fbcfdfd9ebc259